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91. Low-frequency noise in gallium nitride nanowire mechanical resonators
Topic: Chemistry
Published: 12/7/2012
Authors: Jason Gray, Kristine A Bertness, Norman A Sanford, Charles T. Rogers
Abstract: We report on the low-frequency 1/f (flicker) parameter noise displayed by the resonance frequency and resistance of doubly clamped c-axis gallium nitride nanowire (NW) mechanical resonators. The resonators are electrostatically driven and their mech ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909950

92. Using Limestone to Reduce Set Retardation in High Volume Fly Ash Mixtures: Improving Constructability for Sustainability
Topic: Chemistry
Published: 12/3/2012
Authors: Lisa Renay Gurney, Dale P Bentz, Taijiro Sato, Jason Weiss
Abstract: From a sustainability perspective, high volume fly ash (HVFA) concretes are attractive not only because of the reduction in cement content and its associated greenhouse gases that they provide, but also because they avoid landfilling excessive quanti ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909251

93. Biometrics in a Networked World
Topic: Chemistry
Published: 12/2/2012
Author: Kevin C Mangold
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911889

94. Precise conductance measurements of a pinhole orifice using a constant-pressure flowmeter
Topic: Chemistry
Published: 12/1/2012
Authors: James A Fedchak, Dana R Defibaugh
Abstract: A pinhole orifice with a known conductance can be used as the basis of a flowmeter. Commercially available laser-drilled pinhole orifices with diameters ranging from 1.0 μm to 50 μm can have conductances ranging from about 0.1 μL/s to ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908391

95. A Humidity Generator for Temperatures to 200 °C and Pressures to 1.6 MPa
Topic: Chemistry
Published: 11/30/2012
Authors: D Vega-Maza, W Wyatt Miller, Dean C Ripple, Gregory E Scace
Abstract: We have constructed a new humidity generator that produces gas streams of known moisture content at temperatures from 85 °C to 200 °C, absolute pressures from 0.2 MPa to 1.6 MPa, and relative humidities from 10 % to 90 %. The generator produces a moi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905234

96. Mitigation of Autogenous Shrinkage in Alkali Activated Slag Mortars by Internal Curing
Topic: Chemistry
Published: 11/19/2012
Authors: Aaron Richard Sakulich, Dale P Bentz
Abstract: Alkali activated slag shows considerable promise as an environmentally friendly alternative to binders produced from ordinary portland cement (OPC). The shrinkage behavior of alkali activated slags, however, is not well understood, and is a hurdl ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911271

97. Modeling Chloride transport in Cracked Concrete: A 3-D image-based microstructure simulation
Topic: Chemistry
Published: 10/3/2012
Authors: Edward Joseph Garboczi, Dale P Bentz, Jeffrey M. Davis, Yang Lu
Abstract: The prediction of the service life of concrete materials is difficult, mainly because of their complex heterogeneous microstructure and their random nature. Studying the presence of cracks in concrete and their effect on chloride transport and reacti ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912153

98. Biosynthesis of Athmu, a alpha,gamma-hydroxy-ß-amino acid of pahayokolides A-B
Topic: Chemistry
Published: 10/2/2012
Authors: Li Liu, Daniel W Bearden, Juan C. Rodriguez, Kathleen S. Rein
Abstract: Pahayokolides A-B are cyanobacteria derived non-ribosomal peptides which exhibit cytotoxicity against a number of cancer cell lines. The biosynthetic origin of the 3-amino-2,5,7,8- tetrahydroxy-10-methylundecanoic acid (Athmu) moiety has been inv ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912206

99. A 4:1 transmission-line impedance transformer for broadband superconducting circuits
Topic: Chemistry
Published: 10/1/2012
Authors: Leonardo Matteo Ranzani, Lafe F. Spietz, Jose Alberto Aumentado, Zoya Popovic
Abstract: We present a 4 : 1 superconducting transmission-line impedance transformer for cryogenic applications. The device transforms 25 {Omega} in the coplanar waveguide to 6.25 {Omega} in the microstrip and is designed to operate at 20 mK. Calibrated me ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910366

100. Guidelines for Access Control System Evaluation Metrics
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7874
Topic: Chemistry
Published: 9/14/2012
Authors: Chung Tong Hu, Karen Scarfone
Abstract: The purpose of this document is to provide Federal agencies with background information on access control (AC) properties, and to help access control experts improve their evaluation of the highest security AC systems. This document discusses the ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911110



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